What actions demonstrate that primordial beast is in buck?

Different actions that demonstrate Buck's primordial side are his alertness, his desire to learn, and his ability to adapt. He fought in order to learn, and he backed away in order to survive. He was deliberate in his actions and showed no impatience. Buck built up his body, which was soft from civilized living and learned to be crafty. And finally, when he deemed himself ready, he challenged and won the position of leadership he craved.